From 8b33309ba20ddbdf925a78f44e34599be8736117 Mon Sep 17 00:00:00 2001
From: MP <pellegrino.marco@icloud.com>
Date: Wed, 28 Aug 2024 15:07:06 +0200
Subject: [PATCH] :bug: IsOnPlane

comparison with tolerance.
---
 FemDesign.Core/Geometry/Point3d.cs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/FemDesign.Core/Geometry/Point3d.cs b/FemDesign.Core/Geometry/Point3d.cs
index a14abe78..2c81cf96 100644
--- a/FemDesign.Core/Geometry/Point3d.cs
+++ b/FemDesign.Core/Geometry/Point3d.cs
@@ -173,8 +173,10 @@ public static bool ArePointsOnPlane(List<Point3d> points)
 
             for(int j = 0; j < points.Count; j++)
             {
-                bool IsOnPlane = (a * points[j].X + b * points[j].Y + c * points[j].Z + d) == 0;
-                if (IsOnPlane == true)
+                double IsOnPlane = a * points[j].X + b * points[j].Y + c * points[j].Z + d;
+
+                // check is IsOnPlane is within tolerance
+                if (Math.Abs(IsOnPlane) <= Tolerance.LengthComparison)
                     continue;
                 else
                     return false;